what will be the 1+2+3+.....+55=??
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I think this is the answer. hope it helps you and I wish you a very happy new year! it is the formula used for the sum of series of natural numbers.
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it is an arithmetic progression.
where the first term is 1 and the common difference is also 1
an=a+(n-1)d
55=1+(n-1)1
55-1=n-1
55-1+1=n
n=55......now take out the sum of 55terms via this formula_Sn=n/2{2a+(n-1)d}....thanks.
where the first term is 1 and the common difference is also 1
an=a+(n-1)d
55=1+(n-1)1
55-1=n-1
55-1+1=n
n=55......now take out the sum of 55terms via this formula_Sn=n/2{2a+(n-1)d}....thanks.
jackson97:
the answer will be 1540for sure.
thnq
Sn =55/2{1*2+(55-1)1}=1540
please mark my answer as brainlist
I think the AP process is the right process to proceed.
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if u like, please mark it as a brainliest answer.
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